Closure for collapsible tubes



F. E. BALDWIN CLOSURE FOR COLLAFSIBLE TUBES Nov. 10, 1925. 1,561,298

Filed June 6. 1925 1 f fyj. 1

y wwn is ,5 W 414 11/750771 pered nozzle 2 above its base 6, the taperof Patented Nov. 10, 1925.

UNITED STATES rnnnnnro. BALDWIN, or PHILADELPHIA, rEnnsYLvANm.

CLOSURE FOR COLLAPSIBLE TUBES.

Application filed June 6, 1925. Serial No. 35,353.

To all'whom it may concern: Be it known that I, Fnnnnnrc E. BALDWIN, acitizen of the United States, residing at Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented a new and usefulImprovement in Closures for Oollapsible'Tubes, OfWhlCll the following isa specification. K

One object of the present invention is to provide a metal to metalclosure for collapsible' tubes which shall be sufficiently tight forpreventing leakage and evaporation of the contents of the tubes.

Other objects of the invention will appear from the followingdescription and the invention will be claimed at the end hereof but willbe first described in connection with the embodiment of it chosen fromamong other embodiments of it for the sake of illustration in theaccompanying drawing forming part hereof and in which Figure 1 is aview, partly in elevation and partly in' central section, of acollapsible tube having a closure embodyingfeatures of the invention. vr

Fig. 2 is a view drawn to an enlarged scale in order toillustratefeatures of construction-show'n in Figure 1.

Figs. 3 and 41 are views similar to Figs. 1 and 2 and illustrating amodification, and

Figs. -5 and 6 are views. similarto Figs. 2 and 4' illustratingothermodifications in which the bevel or taper is omitted from one ofthe co-operating elements.

Referring to Figs. 1 andf2, above the screw threaded neckl I form orprovide a nozzle 2 slightly tapered from the parallel or, in otherwords, of the form of a frustum of a cone. In the cap 31 form ataperedrecess 4: of such diameter that the 'corner portion 5, which should beas sharp as con- 'venient, will engage the surface of the tathe curvedWall 7 ofmthe recess'be'ing less than the taper of the curved wall ofthe nozzle 2. Otherlwise stated, thecurved wall of the nozzle 2 istapered as is also the curved wall of the recessl, and the taper of eachof those walls is in the same direction but difiers in degree.

The operation may lows:

When the nal threadin engagement with the external be described as.folcap is in place with its interthread' of the neck 1' and isscreweddown,

the corner or edge 5 engages the wallof the nozzle 2 at some distanceabove its. base 6,

r and the metal being soft and the taper slight the action of the screwthread forces the cap 3 down the tapered nozzle 2, thus expanding thecorner 5 of the cap 3 and also perhaps compressing the nozzle 2 with theresult that there'is formed a tapered ground metal to metal joint whichis tight against leakage. As the joint wears from usage the cap descendsfurther and'further down thenozzle 2 and thusthe [joint continues to betight. tion of the modification illustrated in Figs. 3 and 4: are thesame as above described except that the-taper of the curvedwall ofthe'cap is greater than the taper of the The construction and mode ofopera-Q curved Wall of the nozzle and the'corner 5 may be regarded as onthe nozzle instead of on the'cap. Generally stated, the construction ofFigs. 3 and is a reversal of the construction of Figs. 1 and 2. I

The construction and mode of operation of the modifications illustratedin Figs. 5 and 6 are as above described exceptthe taper or bevel isomitted from one of the cooperating joint forming elements. In Fig. '5the wall 7 of the cavity in the cap is cylindrical and in Fig. 6 theexternal curved wall of the nozzle 2 is cylindrical. I,

It will be obvious to those skilled in the art that modifications may bemade in details of constructionand arrangement without departing fromthe spirit of theinvention which is not limited to such? mattersor tomatters of mere form or otherwise than the prior art and the appendedclaims may require.

I claim: j 1. A closure for collapsible tubes having a threaded neck anda nozzle above the neck,

and a cap' adapted to engage the threaded neck, the ca vbeing providedwith a cavity adapted to encircle the nozzleand to' engage the same witha rotary sliding motion,

and the contacting parts between said nozzle and cap being tapered atdiflerent angles.

2. A closure for collapsible tubes havmg a threaded neck and a taperednozzle above the neck, and a cap adapted to engage the threaded neck,the cap being provided with a. cavity, the taper of the cavity beingless than that of the nozzle, the bottom edge of.

the cavity being formed to engage the nozzle at a distance above thethreaded neck, and the closure being formed by lateral pressure betweenthe nozzle and the Wall of the cavity in the cap.

3. A closure for collapsible tubes having 'a threaded neck'and a nozzleabove the neck provided with a tapered wall, and a cap adapted to engagethe threaded neck, the cap being provided with a cavity having a taperedWall, the taper of the cavity being less than that of the nozzle, thebottom edge of the cavity being formed to engage the nozzle at adistance above the threaded neck, and the closure being formed by lat-4. A closure for collapsible tubes having a threaded neck and a nozzleabove the neck,

and a cap adapted to engage the threaded neck, the cap being providedwith a cavity of which the internal Wall is adapted to receive thenozzle and to engage the external wall of the same with a rotary slidingmotion, at least one of the co-acting \valls being tapered to providecontact surfaces disposed at an inclination in respect to each other.

FREDERIC E. BALDTVIN.

